Abstract: With view to the stable operation of the system, the data center needs to consume a lot of energy to maintain the indoor temperature every year. A more energy-saving and economical cold source system for the data center is greatly needed to reduce the energy consumption of air conditioning. Taking a data center project as an example, combined with the selection and operation mode of the cold source system, this paper analyzes the energy-saving effect of the system so as to provide a reference for the comparison of cold source schemes of high energy consuming projects.